The Ford GT has stunned onlookers since its inception in the 1960s. Back then it was called the GT40, because of its height in inches. It stunned the world when it won the 24 Hours of Le Mans and it stunned Americans again in 2005 when the reimagined Ford GT hit the streets. Fast forward to 2016 and you can guess what happened both on the track and off.

The latest car uses a 3.5-liter twin-turbocharged V6 making 660 hp and there's now even a track only version delivering 700 ponies from that same engine. But since then, something new is going on. Ford Authority's "unnamed sources" spotted a Ford GT cruising around the streets of Metro Detroit, and it didn't sound like it had a V6 engine, which has let the speculators run wild. Unfortunately, sources have revealed to CarBuzz that it's not one of Ford's vehicles.

But we can still shoot some guesses as to what's under the hood of this monstrosity. The Ford GT is still small and low. That means it probably couldn't support the company's new 7.3-liter V8 Godzilla truck engine, though we know the company is selling it as a crate motor and is testing it with forced induction. We heard rumors of more than 1,000 hp. But we are looking for a special sendoff as production of the GT is slated to end in 2022.

Ford could pull a little more power from the V6, but it wouldn't be a historic bookend for the generation, which is what we want. That leaves the GT500's supercharged 5.2-liter V8 Predator as an option. The supercharger does make the engine taller, on the other hand, the weird GT we spotted in June was sporting a massive roof scoop, which could feed right into that blower. Ford made 760 hp with that engine in the Mustang, but we could easily see something in the 800-hp range for the GT, which only weighs about 3,000 pounds.

We expect the same seven-speed dual-clutch transmission with paddle shifters to send power to the rear wheels. We'd also guess the 2022 model will get some sort of special badging to note the final edition. Heck, it might even be called Ford GT Final Edition. That would go with Heritage Edition and Liquid Carbon Edition.

We talked to Ford, who is notoriously tight lipped on these things. A rep told us that the GT running around the city is not its car after seeing that the manufacturer's plate doesn't line up with Ford's usual ones. It could be from the manufacturer Multimatic, which has a home a few hours away from Detroit in Canada, and builds all the Ford GTs. That would make the most sense. Unfortunately we'll have to wait a little longer to see what Ford has in store for the final GT.